Methods for semi-automated index generation for high precision information retrieval

.............................................................................................................................. v Acknowledgements ...........................................................................................................vii List of Tables..................................................................................................................... xv List of Figures .................................................................................................................xvii Chapter 1: Introduction ....................................................................................................... 1 1.1 The Nature of Medical Information ........................................................................ 2 1.2 Clinicians’ Information Needs ................................................................................ 3 1.3 Evaluation of Indexes of Medical Information through Information Retrieval system Performance ................................................................................................ 4 1.4 High-precision Information Indexing and Retrieval ............................................... 6 1.5 Internet-based Semi-automated Indexing of Documents ...................................... 10 1.6 An ISAID Indexing Example ................................................................................ 14 1.7 Evaluation of the ISAID system............................................................................ 15 1.8 Guide to the Dissertation....................................................................................... 16 Chapter 2: Access to Medical Information ....................................................................... 19 2.1 Evaluation of Information Retrieval Systems ....................................................... 20 2.2 Indexing and Retrieval by Document Keyword.................................................... 22 2.2.1 Searching the MEDLINE Index ................................................................... 23 2.2.2 Limitations of Search-Accuracy with Keyword Indexing ........................... 29 2.3 Alternative Approaches to Medical-Information Indexing and Retrieval............. 30 2.3.1 Word-Statistical Systems ............................................................................. 31 2.3.2 Linguistic Information-Retrieval Systems ................................................... 34 2.3.3 Knowledge-Based Systems .......................................................................... 35 2.3.3.1 Context-Model–Based Systems .......................................................... 36 2.3.3.2 Knowledge-Based Query Formulation................................................ 39

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